Remove versionadded/versionchanged notes for 2.9

docs/advanced_topics/images/custom_image_model.rst

@@ -47,10 +47,6 @@ Here's an example:
             )
 
 
-.. versionchanged:: 2.9
-
-    Fields on a custom image model can now be defined as required (``blank=False``).
-
 Then set the ``WAGTAILIMAGES_IMAGE_MODEL`` setting to point to it:
 
 .. code-block:: python

docs/reference/contrib/settings.rst

@@ -227,8 +227,6 @@ Or, alternately, using the ``set`` tag:
 Utilising ``select_related`` to improve efficiency
 --------------------------------------------------
 
-.. versionadded:: 2.9
-
 For models with foreign key relationships to other objects (e.g. pages),
 which are very often needed to output values in templates, you can set
 the ``select_related`` attribute on your model to have Wagtail utilise

docs/reference/pages/model_reference.rst

@@ -280,10 +280,6 @@ The ``Site`` model is useful for multi-site installations as it allows an admini
 
 The :meth:`~wagtail.core.models.Site.find_for_request` function returns the Site object that will handle the given HTTP request.
 
-.. versionchanged:: 2.9
-
-  Previous versions of Wagtail required the middleware class :class:`~wagtail.core.middleware.SiteMiddleware`, which pre-populated ``request.site`` with the site object. This is now deprecated, to avoid redundant database queries and potential clashes with Django's Sites framework.
-
 
 Database fields
 ~~~~~~~~~~~~~~~

docs/reference/settings.rst

@@ -551,10 +551,6 @@ By default the redirect importer keeps track of the uploaded file as a temp file
 Form builder
 ============
 
-.. versionadded:: 2.7.4/2.9.3
-
-    The ``WAGTAILFORMS_HELP_TEXT_ALLOW_HTML`` option was added.
-
 .. code-block:: python
 
     WAGTAILFORMS_HELP_TEXT_ALLOW_HTML = True

docs/topics/writing_templates.rst

@@ -231,10 +231,6 @@ Returns the Site object corresponding to the current request.
 
     {% wagtail_site as current_site %}
 
-.. versionadded:: 2.9
-
-  In previous versions, the recommended way to refer to the current site was through the ``request.site`` attribute provided by :class:`~wagtail.core.middleware.SiteMiddleware`; this is now deprecated.
-
 .. _wagtailuserbar_tag:
 
 Wagtail User Bar